16
No.332016
CX-9
3
12 3 Engine Design Engineering Dept. Engine Performance Development Dept.
4 5 6 Powertrain Technology Development Dept. Powertrain Planning Dept. Powertrain Development Div.
SKYACTIV-G 2.5T Newly Developed Gasoline Engine "SKYACTIV-G 2.5T"
Zoom-Zoom
SKYACTIV-G2.5LCX-9
NA
Summary Based on Mazdas long term technology development strategy (Sustainable Zoom-Zoom), a new series of
SKYACTIV-G gasoline engines were developed to realize both fun-to-drive and environmental performance at high level. As a further evolved form of SKYACTIV-G, new 2.5L turbocharged engine was developed to be mounted on the All-New Mazda CX-9. In the process of developing the new engine, as a fresh departure from the current downsizing engine, turbo-lag, which is the weak point of a turbocharged engine, was overcome, and transient response and torque controllability equivalent to a large-displacement natural aspiration engine were realized. As a result, lively driving and more torqueing-full performance were brought into reality and class-top fuel economy was achieved with an expanded low specific fuel consumption area. This article introduces the concept and the technologies applied to this engine.
1.
SKYACTIV-GZoom-Zoom(1)(2)(3)
CX-92.5LFig. 1
34L
SKYACTIV-G
Fig. 1 SKYACTIV-G 2.5T
2 1 3 Einosuke Suekuni Mitsuyuki Murotani Tomoaki Fujiyama
5 4 6 Kouhei Iwai Naoyuki Yamagata Reiji Okita
17
No.332016
2.
CX-9Mazda
V6
CX-9
2.5LDynamic Pressure Turbo
Cooled EGR
Cooled EGR
SKYACTIV-G
3.
Fig. 27
Fig. 2 Vision for Evolution of Internal Combustion Engine
2.5LCooled EGR
Table 1SKYACTIV-G 2.5L NA
SKYACTIV-G
Cooled EGR
2.5L NA1310.589mm
Table 1 Dimension and Specifications
4.
4.1 CX-9
Fig. 3
Fig. 41250rpm350Nm420Nm/2000rpm169kW(230PS)/5000rpm186kW(253PS)
SKYACTIV-G 2.5 NEW SKYACTIV-G 2.5TIn-Line4
2488cm3
89mmx100mm 13 10.5
Small Cavity Piston Large Cavity PistonDI
6Hole Injector)
Open(BTDC) -3242 -2450Close(ABDC) 11036 10026Open(BBDC) 5813 505Close(ATDC) 651 247
Electric Hydraulic
HLA+Roller follower 50mmx50mm
RollerSilent
Electric control2stage)
Electric controlVariable)
Water Jacket spacer w/o Plastic spacerw/o HP-Cooled EGR
Turbocharger System w/oDynamic pressure turbo
System
138kW(188PS)*1
/5700prm
142kW192PS)*2
/5700rpm
169kW(230PS)*1
/5000rpm
186kW253PS)*2
/5000rpm
250Nm*2
/3250prm
256Nm*1
/3250rpm420Nm/2000rpm
*1Regular Gasoline*2Premium Gasoline
Crank main/pin journal diaValve train
EngineEngine Type
Displacement
BorexStrokeCompression ratioCombustion chamber
Chain typevalve trainOil
Oil Pump
EGR System
Max.Power
Max Torque
Fuel Injection
Intake-ValveTimingExhaust-Valve TimingInt.S-VTEx.S-VT
Distance to idealFar Close
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No.332016
Fig. 3 Vehicle Transient Acceleration
Fig. 4 Engine Performance
4.2 5000rpm
169kW186kWCooled EGR2.5L SKYACTIV-GNA
SKYACTIV-GCooled EGRFig. 5
Fig. 5 Fuel Consumption Characteristics
190km/h=1Fig. 6
Fig. 6 =1 Area of Engine Operation
5.
5.1
NA
Fig.7
Fig. 7 Theory of Dynamic Pressure Turbo
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No.332016
Q
Pi
1/
: : : :
1620rpm
215Fig. 8
Fig. 8 Effect of Dynamic Pressure Turbo System 1620rpm
A/RAreaRadius
20~25
4-3
Fig. 9Fig. 10Fig. 10
Fig. 132A/R
Fig. 9 Cylinder Head Exh. Port and Water Jacket
Fig. 10 Dynamic Pressure Turbo System
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No.332016
900
CAE
Fig. 11 Dynamic Pressure Turbo System
Fig. 12 Exhaust Manifold with Variable Valve
Fig. 13 Twin Flow Turbocharger
5.2 Cooled EGR High-
pressure Cooled EGRFig. 14
Fig. 15EGR Cooler
Fig. 14 Cooled EGR System
Fig. 15 EGR MAP
EGR
EGREGR Cooler2
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No.332016
EGR950150Cooled EGR10NA
6. NVH
2.5LSKYACTIV-G 2.5Table 1
6.1 SKYACTIV-G
Cavity Piston10.5Fig.162.5L NA
212Fig.17
Fig. 16 Large Cavity Piston
Fig. 17 High Tumble Port
6.2
Fig.18
275%2.5L NA
Fig. 18 Comparison of Oil Pump
6.3
Fig.19
Fig. 19 Water Jacket Spacer
SKYACTIV-G 2.5T 10.5 SKYACTIV-G 2.5L NA =13
SKYACTIV-G 2.5L NA SKYACTIV-G 2.5T
High tumble edge machining
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No.332016
6.4 NVH
NVH
63
USA LEVEU Stage6
7.
SKYACTIV-G2.5L
One Mazda
CX-9
1No.29pp.8-132011
2CX-5 SKYACTIV-GNo.30pp.3-82012
3No.32 pp.124-1272015
http://www.mazda.com/contentassets/47ee2eee71074235b39ec78d6e514d28/files/2011_no003.pdfhttp://www.mazda.com/contentassets/47ee2eee71074235b39ec78d6e514d28/files/2011_no003.pdfhttp://www.mazda.com/contentassets/c9c12efa86a64ebab4353fb441ff3b9c/files/2012_no002.pdfhttp://www.mazda.com/contentassets/c8bdee142bcb4b3b8da1a0f9b4a46785/files/2015_no021.pdfhttp://www.mazda.com/contentassets/c8bdee142bcb4b3b8da1a0f9b4a46785/files/2015_no021.pdf
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